﻿using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace OfficeWatermark
{
    public static class ImageProcessor
    {

        public static System.Drawing.Image DrawText(String text, System.Drawing.Font font, Color textColor, Color backColor, double height, double width)
        {
            //定义图片宽度和告诉
            Image img = new Bitmap((int)width, (int)height);
            Graphics drawing = Graphics.FromImage(img);
            //获取文本size
            SizeF textSize = drawing.MeasureString(text, font);
            //文本显示样式及位置
            drawing.TranslateTransform(((int)width - textSize.Width) / 2, ((int)height - textSize.Height) / 2);
            drawing.RotateTransform(-45);
            drawing.TranslateTransform(-((int)width - textSize.Width) / 2, -((int)height - textSize.Height) / 2);
            drawing.Clear(backColor);
            Brush textBrush = new SolidBrush(textColor);
            drawing.DrawString(text, font, textBrush, ((int)width - textSize.Width) / 2, ((int)height - textSize.Height) / 2);
            drawing.Save();
            return img;
        }

        public static System.Drawing.Image DrawMutipleText(String text
            , System.Drawing.Font font,
            Color textColor, Color backColor, double height, double width)
        {
            //定义图片宽度和告诉
            Image img = new Bitmap((int)width, (int)height);
            Graphics drawing = Graphics.FromImage(img);
            //获取文本size
            SizeF textSize = drawing.MeasureString(text, font);
            //文本显示样式及位置
            //drawing.TranslateTransform(((int)width - textSize.Width) / 2, ((int)height - textSize.Height) / 2);

            //drawing.TranslateTransform(-((int)width - textSize.Width) / 2, -((int)height - textSize.Height) / 2);
            drawing.Clear(backColor);
            Brush textBrush = new SolidBrush(textColor);
            drawing.RotateTransform(-45);

            int FontWidth = Convert.ToInt32(textSize.Width * 0.5);//文字水印的宽
            int rows = (int)(height / FontWidth);
            int cols = (int)(width / FontWidth);


            for (int i = 0; i < rows; i++)
            {
                for (int j = 0; j < cols; j++)
                {

                    int x = i * FontWidth + j * FontWidth;
                    int y = -i * FontWidth + j * FontWidth;

                    drawing.DrawString(text, font, textBrush,
                        x, y);

                }
            }


            drawing.Save();
            return img;
        }

        public static int CheckH(string str)
        {
            if (string.IsNullOrEmpty(str))
            {
                return 0;
            }
            List<string> itemList = new List<string>();
            CharEnumerator CEnumerator = str.GetEnumerator();
            Regex regex = new Regex("^[\u4E00-\u9FA5]{0,}$");
            while (CEnumerator.MoveNext())
            {
                if (regex.IsMatch(CEnumerator.Current.ToString(), 0))
                    itemList.Add(CEnumerator.Current.ToString());
            }
            return itemList.Count;
        }
        public static Image AddWatermarkText(string watermarkText, Color textColor, Color backColor, int width, int height)

        {
            int fontSize = 20;
            Font crFont = new Font("微软雅黑", fontSize, FontStyle.Bold);

            int H = CheckH(watermarkText);//汉字数量

            int fontWidth = (int)(H * 1.38 * (int)fontSize + (watermarkText.Length - H) * 0.75 * (int)fontSize);

            int max = (int)(width * 1.5);


            Image bmWaterMark = new Bitmap(max, max, PixelFormat.Format32bppArgb);

            Graphics gWaterMark = Graphics.FromImage(bmWaterMark);

            SizeF crSize = gWaterMark.MeasureString(watermarkText, crFont);

            gWaterMark.TranslateTransform(0, 0);

            //gWaterMark.RotateTransform(-45);

            // 画文字

            gWaterMark.SmoothingMode = SmoothingMode.AntiAlias;
            gWaterMark.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;

            Brush solidBrush3 = new SolidBrush(Color.FromArgb(255, Color.Black));


            int FontWidth = (int)crSize.Width;

            int verticalSpace = 40;//垂直间距

            int horizontalSpace = 30;//水平间距

            //int FontWidth = watermarkText.Length;//文字水印的宽

            int rowsNumber = (int)(bmWaterMark.Height / (fontSize + verticalSpace) + 1);// 图片的高除以文字水印的宽——> 打印的行数(以文字水印的宽为间隔)

            int columnsNumber = bmWaterMark.Width / (fontWidth + horizontalSpace) + 1;//图片的宽除以文字水印的宽 ——> 每行打印的列数(以文字水印的宽为间隔)

            //防止图片太小而文字水印太长，所以至少打印一次

            //gWaterMark.TranslateTransform(bmWaterMark.Width/2, bmWaterMark.Height/2);
            //gWaterMark.RotateTransform(-45);
            for (int j = 0; j < rowsNumber; j++)

            {

                for (int i = 0; i < columnsNumber; i++)

                {

                    int x = i * (fontWidth + horizontalSpace) + 20;
                    int y = (int)(j * (fontSize + verticalSpace) + 20);
                    //画出水印,并设置水印位置

                    gWaterMark.DrawString(watermarkText, crFont, solidBrush3,
                        new PointF(x, y));

                }

            }
            gWaterMark.Save();
            bmWaterMark = RotateImageHeight(bmWaterMark, -45, max, max);
            //gWaterMark.RotateTransform(-45);


            return bmWaterMark;

        }
        private static Image RotateImageHeight(System.Drawing.Image b, float angle, int width, int height)
        {
            angle = angle % 360;            //弧度转换
            double radian = angle * Math.PI / 180.0;
            double cos = Math.Cos(radian);
            double sin = Math.Sin(radian);
            //原图的宽和高
            int w = b.Width;
            int h = b.Height;
            int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));
            int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));
            W = W > 10000 ? 9999 : W;
            H = H > 10000 ? 9999 : H;
            //目标位图
            System.Drawing.Image dsImage = new Bitmap(W, H);
            System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
            //g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

            //计算偏移量
            Point Offset = new Point((W - w) / 2, (H - h) / 2);
            //构造图像显示区域：让图像的中心与窗口的中心点一致
            Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);
            Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
            g.TranslateTransform(center.X, center.Y);
            g.RotateTransform(360 - angle);
            //恢复图像在水平和垂直方向的平移
            g.TranslateTransform(-center.X, -center.Y);
            g.DrawImage(b, rect);
            //重至绘图的所有变换
            g.ResetTransform();
            g.Save();
            g.Dispose();
            ////裁剪图片
            {
                int _width = (dsImage.Width - width) / 2;
                int _height = (dsImage.Height - height) / 2;

                width = width > 1920 * 2 ? 1920 * 2 : width;
                height = height > 1080 * 2 ? 1080 * 2 : height;

                //创建图像
                Rectangle drawRect = new Rectangle(0, 0, width, height);  //绘制整块区域
                System.Drawing.Image tmp = new Bitmap(drawRect.Width, drawRect.Height);           //按指定大小创建位图
                Rectangle AdrawRect = new Rectangle(_width, _height, width, height);
                //绘制
                Graphics gn = Graphics.FromImage(tmp);                   //从位图创建Graphics对象
                gn.Clear(Color.FromArgb(0, 0, 0, 0));                    //清空
                gn.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
                gn.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
                gn.DrawImage(dsImage, drawRect, AdrawRect, GraphicsUnit.Pixel);   //从pic的给定区域进行绘制

                gn.Save();
                return dsImage;

            }

        }


        /// <summary>
        /// 调节图片的透明度
        /// </summary>
        /// <param name="bitmapImg">图像对象</param>
        /// <param name="alpha">调节度</param>
        /// <returns>调节后的图形对象</returns>
        public static Bitmap SetImgAlpha(Bitmap bitmapImg, int alpha)
        {
            Bitmap bitmap = new Bitmap(bitmapImg.Width, bitmapImg.Height, PixelFormat.Format32bppArgb);
            for (int h = 0; h < bitmapImg.Height; h++)
            {
                for (int w = 0; w < bitmapImg.Width; w++)
                {
                    Color color = bitmapImg.GetPixel(w, h);
                    bitmap.SetPixel(w, h, Color.FromArgb(alpha, color.R, color.G, color.B));
                }
            }
            return bitmap;
        }
        /// <summary>
        /// 处理图片透明操作
        /// </summary>
        /// <param name="srcImage">原始图片</param>
        /// <param name="opacity">透明度(0.0---1.0)</param>
        /// <returns></returns>
        public static Image TransparentImage(Image srcImage, float opacity)
        {
            float[][] nArray ={ new float[] {1, 0, 0, 0, 0},
                        new float[] {0, 1, 0, 0, 0},
                        new float[] {0, 0, 1, 0, 0},
                        new float[] {0, 0, 0, opacity, 0},
                        new float[] {0, 0, 0, 0, 1}};
            ColorMatrix matrix = new ColorMatrix(nArray);
            ImageAttributes attributes = new ImageAttributes();
            attributes.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
            Bitmap resultImage = new Bitmap(srcImage.Width, srcImage.Height);
            Graphics g = Graphics.FromImage(resultImage);
            g.DrawImage(srcImage, new Rectangle(0, 0, srcImage.Width, srcImage.Height), 0, 0, srcImage.Width, srcImage.Height, GraphicsUnit.Pixel, attributes);

            return resultImage;
        }

        /// <summary>
        /// 在图片上添加平铺倾斜文字水印
        /// </summary>
        /// <param name="sourcePicture">源图片文件</param>
        /// <param name="waterWords">需要添加到图片上的文字</param>
        /// <returns></returns>
        public static Image DrawWords(string waterWords, Color textColor, float opacity, int width, int height)
        {

            Image img = new Bitmap((int)width, (int)(height), PixelFormat.Format32bppArgb);

            Graphics g = Graphics.FromImage(img);

            // 字体 字号 字体样式
            Font drawFont = new Font("微软雅黑", 20, FontStyle.Regular);

            SizeF fontSize = g.MeasureString(waterWords, drawFont);

            float xpos = 0;
            float ypos = 0;

            // 倾斜 -30°
            g.RotateTransform(-45);

            // 循环打印文字水印
            for (int i = -width / 2; i < width * 1.5 + 720; i += 180)
            {
                xpos = i;
                for (int j = -height / 2; j < height * 1.5 + 320; j += 80)
                {
                    ypos = j;
                    g.DrawString(waterWords, drawFont, new SolidBrush(Color.FromArgb(255, textColor)), xpos, ypos);
                }
            }

            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
            ImageCodecInfo ici = null;
            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.MimeType.IndexOf("jpeg") > -1)
                    ici = codec;
            }
            EncoderParameters encoderParams = new EncoderParameters();
            long[] qualityParam = new long[1];

            // 图片质量：0 - 100
            qualityParam[0] = 100;

            EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, qualityParam);
            encoderParams.Param[0] = encoderParam;

            System.Drawing.Image newImage = new System.Drawing.Bitmap((int)img.Width, (int)img.Height);
            //新建一个画板
            System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage);

            //设置质量
            newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            //置背景色
            newG.Clear(Color.Transparent);

            //画图
            newG.DrawImage(img, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, img.Width, img.Height), System.Drawing.GraphicsUnit.Pixel);
            newG.Save();

            return TransparentImage(img,(float)opacity);
            //return img;
        }


        public static Image CreateTransparentImage(int width, int height)
        {
            Image img = new Bitmap((int)width, (int)(height), PixelFormat.Format32bppArgb);
            Graphics g = Graphics.FromImage(img);
            g.DrawImage(img, 0, 0, img.Width, img.Height);
            g.Clear(Color.Transparent);
            g.Save();
            return img;
        }

        #region 正方型裁剪并缩放

        /// <summary>
        /// 正方型裁剪
        /// 以图片中心为轴心，截取正方型，然后等比缩放
        /// 用于头像处理
        /// </summary>
        /// <remarks>吴剑 2012-08-08</remarks>
        /// <param name="fromFile">原图Stream对象</param>
        /// <param name="fileSaveUrl">缩略图存放地址</param>
        /// <param name="side">指定的边长（正方型）</param>
        /// <param name="quality">质量（范围0-100）</param>
        public static void CutForSquare(System.IO.Stream fromFile, string fileSaveUrl, int side, int quality)
        {
            //创建目录
            string dir = Path.GetDirectoryName(fileSaveUrl);
            if (!Directory.Exists(dir))
                Directory.CreateDirectory(dir);

            //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
            System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);

            //原图宽高均小于模版，不作处理，直接保存
            if (initImage.Width <= side && initImage.Height <= side)
            {
                initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            else
            {
                //原始图片的宽、高
                int initWidth = initImage.Width;
                int initHeight = initImage.Height;

                //非正方型先裁剪为正方型
                if (initWidth != initHeight)
                {
                    //截图对象
                    System.Drawing.Image pickedImage = null;
                    System.Drawing.Graphics pickedG = null;

                    //宽大于高的横图
                    if (initWidth > initHeight)
                    {
                        //对象实例化
                        pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);
                        pickedG = System.Drawing.Graphics.FromImage(pickedImage);
                        //设置质量
                        pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                        pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                        //定位
                        Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight);
                        Rectangle toR = new Rectangle(0, 0, initHeight, initHeight);
                        //画图
                        pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
                        //重置宽
                        initWidth = initHeight;
                    }
                    //高大于宽的竖图
                    else
                    {
                        //对象实例化
                        pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);
                        pickedG = System.Drawing.Graphics.FromImage(pickedImage);
                        //设置质量
                        pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                        pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                        //定位
                        Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth);
                        Rectangle toR = new Rectangle(0, 0, initWidth, initWidth);
                        //画图
                        pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
                        //重置高
                        initHeight = initWidth;
                    }

                    //将截图对象赋给原图
                    initImage = (System.Drawing.Image)pickedImage.Clone();
                    //释放截图资源
                    pickedG.Dispose();
                    pickedImage.Dispose();
                }

                //缩略图对象
                System.Drawing.Image resultImage = new System.Drawing.Bitmap(side, side);
                System.Drawing.Graphics resultG = System.Drawing.Graphics.FromImage(resultImage);
                //设置质量
                resultG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                resultG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                //用指定背景色清空画布
                resultG.Clear(Color.White);
                //绘制缩略图
                resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel);

                //关键质量控制
                //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
                ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
                ImageCodecInfo ici = null;
                foreach (ImageCodecInfo i in icis)
                {
                    if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")
                    {
                        ici = i;
                    }
                }
                EncoderParameters ep = new EncoderParameters(1);
                ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);

                //保存缩略图
                resultImage.Save(fileSaveUrl, ici, ep);

                //释放关键质量控制所用资源
                ep.Dispose();

                //释放缩略图资源
                resultG.Dispose();
                resultImage.Dispose();

                //释放原始图片资源
                initImage.Dispose();
            }
        }

        #endregion

        #region 自定义裁剪并缩放

        /// <summary>
        /// 指定长宽裁剪
        /// 按模版比例最大范围的裁剪图片并缩放至模版尺寸
        /// </summary>
        /// <remarks>吴剑 2012-08-08</remarks>
        /// <param name="fromFile">原图Stream对象</param>
        /// <param name="fileSaveUrl">保存路径</param>
        /// <param name="maxWidth">最大宽(单位:px)</param>
        /// <param name="maxHeight">最大高(单位:px)</param>
        /// <param name="quality">质量（范围0-100）</param>
        public static void CutForCustom(System.IO.Stream fromFile, string fileSaveUrl, int maxWidth, int maxHeight, int quality)
        {
            //从文件获取原始图片，并使用流中嵌入的颜色管理信息
            System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);

            //原图宽高均小于模版，不作处理，直接保存
            if (initImage.Width <= maxWidth && initImage.Height <= maxHeight)
            {
                initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            else
            {
                //模版的宽高比例
                double templateRate = (double)maxWidth / maxHeight;
                //原图片的宽高比例
                double initRate = (double)initImage.Width / initImage.Height;

                //原图与模版比例相等，直接缩放
                if (templateRate == initRate)
                {
                    //按模版大小生成最终图片
                    System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWidth, maxHeight);
                    System.Drawing.Graphics templateG = System.Drawing.Graphics.FromImage(templateImage);
                    templateG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                    templateG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                    templateG.Clear(Color.White);
                    templateG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, maxWidth, maxHeight), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);
                    templateImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
                }
                //原图与模版比例不等，裁剪后缩放
                else
                {
                    //裁剪对象
                    System.Drawing.Image pickedImage = null;
                    System.Drawing.Graphics pickedG = null;

                    //定位
                    Rectangle fromR = new Rectangle(0, 0, 0, 0);//原图裁剪定位
                    Rectangle toR = new Rectangle(0, 0, 0, 0);//目标定位

                    //宽为标准进行裁剪
                    if (templateRate > initRate)
                    {
                        //裁剪对象实例化
                        pickedImage = new System.Drawing.Bitmap(initImage.Width, (int)System.Math.Floor(initImage.Width / templateRate));
                        pickedG = System.Drawing.Graphics.FromImage(pickedImage);

                        //裁剪源定位
                        fromR.X = 0;
                        fromR.Y = (int)System.Math.Floor((initImage.Height - initImage.Width / templateRate) / 2);
                        fromR.Width = initImage.Width;
                        fromR.Height = (int)System.Math.Floor(initImage.Width / templateRate);

                        //裁剪目标定位
                        toR.X = 0;
                        toR.Y = 0;
                        toR.Width = initImage.Width;
                        toR.Height = (int)System.Math.Floor(initImage.Width / templateRate);
                    }
                    //高为标准进行裁剪
                    else
                    {
                        pickedImage = new System.Drawing.Bitmap((int)System.Math.Floor(initImage.Height * templateRate), initImage.Height);
                        pickedG = System.Drawing.Graphics.FromImage(pickedImage);

                        fromR.X = (int)System.Math.Floor((initImage.Width - initImage.Height * templateRate) / 2);
                        fromR.Y = 0;
                        fromR.Width = (int)System.Math.Floor(initImage.Height * templateRate);
                        fromR.Height = initImage.Height;

                        toR.X = 0;
                        toR.Y = 0;
                        toR.Width = (int)System.Math.Floor(initImage.Height * templateRate);
                        toR.Height = initImage.Height;
                    }

                    //设置质量
                    pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                    pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

                    //裁剪
                    pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);

                    //按模版大小生成最终图片
                    System.Drawing.Image templateImage = new System.Drawing.Bitmap(maxWidth, maxHeight);
                    System.Drawing.Graphics templateG = System.Drawing.Graphics.FromImage(templateImage);
                    templateG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
                    templateG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                    templateG.Clear(Color.White);
                    templateG.DrawImage(pickedImage, new System.Drawing.Rectangle(0, 0, maxWidth, maxHeight), new System.Drawing.Rectangle(0, 0, pickedImage.Width, pickedImage.Height), System.Drawing.GraphicsUnit.Pixel);

                    //关键质量控制
                    //获取系统编码类型数组,包含了jpeg,bmp,png,gif,tiff
                    ImageCodecInfo[] icis = ImageCodecInfo.GetImageEncoders();
                    ImageCodecInfo ici = null;
                    foreach (ImageCodecInfo i in icis)
                    {
                        if (i.MimeType == "image/jpeg" || i.MimeType == "image/bmp" || i.MimeType == "image/png" || i.MimeType == "image/gif")
                        {
                            ici = i;
                        }
                    }
                    EncoderParameters ep = new EncoderParameters(1);
                    ep.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);

                    //保存缩略图
                    templateImage.Save(fileSaveUrl, ici, ep);
                    //templateImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);

                    //释放资源
                    templateG.Dispose();
                    templateImage.Dispose();

                    pickedG.Dispose();
                    pickedImage.Dispose();
                }
            }

            //释放资源
            initImage.Dispose();
        }
        #endregion

        #region 等比缩放

        /// <summary>
        /// 图片等比缩放
        /// </summary>
        /// <remarks>吴剑 2012-08-08</remarks>
        /// <param name="fromFile">原图Stream对象</param>
        /// <param name="savePath">缩略图存放地址</param>
        /// <param name="targetWidth">指定的最大宽度</param>
        /// <param name="targetHeight">指定的最大高度</param>
        /// <param name="watermarkText">水印文字(为""表示不使用水印)</param>
        /// <param name="watermarkImage">水印图片路径(为""表示不使用水印)</param>
        public static void ZoomAuto(System.IO.Stream fromFile, string savePath, System.Double targetWidth, System.Double targetHeight, string watermarkText, string watermarkImage)
        {
            //创建目录
            string dir = Path.GetDirectoryName(savePath);
            if (!Directory.Exists(dir))
                Directory.CreateDirectory(dir);

            //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
            System.Drawing.Image initImage = System.Drawing.Image.FromStream(fromFile, true);

            //原图宽高均小于模版，不作处理，直接保存
            if (initImage.Width <= targetWidth && initImage.Height <= targetHeight)
            {
                //文字水印
                if (watermarkText != "")
                {
                    using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(initImage))
                    {
                        System.Drawing.Font fontWater = new Font("黑体", 10);
                        System.Drawing.Brush brushWater = new SolidBrush(Color.White);
                        gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10);
                        gWater.Dispose();
                    }
                }

                //透明图片水印
                if (watermarkImage != "")
                {
                    if (File.Exists(watermarkImage))
                    {
                        //获取水印图片
                        using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage))
                        {
                            //水印绘制条件：原始图片宽高均大于或等于水印图片
                            if (initImage.Width >= wrImage.Width && initImage.Height >= wrImage.Height)
                            {
                                Graphics gWater = Graphics.FromImage(initImage);

                                //透明属性
                                ImageAttributes imgAttributes = new ImageAttributes();
                                ColorMap colorMap = new ColorMap();
                                colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
                                colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
                                ColorMap[] remapTable = { colorMap };
                                imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

                                float[][] colorMatrixElements = {
                                   new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},
                                   new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},
                                   new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},
                                   new float[] {0.0f,  0.0f,  0.0f,  0.5f, 0.0f},//透明度:0.5
                                   new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}
                                };

                                ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
                                imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
                                gWater.DrawImage(wrImage, new Rectangle(initImage.Width - wrImage.Width, initImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes);

                                gWater.Dispose();
                            }
                            wrImage.Dispose();
                        }
                    }
                }

                //保存
                initImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg);
            }
            else
            {
                //缩略图宽、高计算
                double newWidth = initImage.Width;
                double newHeight = initImage.Height;

                //宽大于高或宽等于高（横图或正方）
                if (initImage.Width > initImage.Height || initImage.Width == initImage.Height)
                {
                    //如果宽大于模版
                    if (initImage.Width > targetWidth)
                    {
                        //宽按模版，高按比例缩放
                        newWidth = targetWidth;
                        newHeight = initImage.Height * (targetWidth / initImage.Width);
                    }
                }
                //高大于宽（竖图）
                else
                {
                    //如果高大于模版
                    if (initImage.Height > targetHeight)
                    {
                        //高按模版，宽按比例缩放
                        newHeight = targetHeight;
                        newWidth = initImage.Width * (targetHeight / initImage.Height);
                    }
                }

                //生成新图
                //新建一个bmp图片
                System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight);
                //新建一个画板
                System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage);

                //设置质量
                newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

                //置背景色
                newG.Clear(Color.White);
                //画图
                newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);

                //文字水印
                if (watermarkText != "")
                {
                    using (System.Drawing.Graphics gWater = System.Drawing.Graphics.FromImage(newImage))
                    {
                        System.Drawing.Font fontWater = new Font("宋体", 10);
                        System.Drawing.Brush brushWater = new SolidBrush(Color.White);
                        gWater.DrawString(watermarkText, fontWater, brushWater, 10, 10);
                        gWater.Dispose();
                    }
                }

                //透明图片水印
                if (watermarkImage != "")
                {
                    if (File.Exists(watermarkImage))
                    {
                        //获取水印图片
                        using (System.Drawing.Image wrImage = System.Drawing.Image.FromFile(watermarkImage))
                        {
                            //水印绘制条件：原始图片宽高均大于或等于水印图片
                            if (newImage.Width >= wrImage.Width && newImage.Height >= wrImage.Height)
                            {
                                Graphics gWater = Graphics.FromImage(newImage);

                                //透明属性
                                ImageAttributes imgAttributes = new ImageAttributes();
                                ColorMap colorMap = new ColorMap();
                                colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
                                colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
                                ColorMap[] remapTable = { colorMap };
                                imgAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);

                                float[][] colorMatrixElements = {
                                   new float[] {1.0f,  0.0f,  0.0f,  0.0f, 0.0f},
                                   new float[] {0.0f,  1.0f,  0.0f,  0.0f, 0.0f},
                                   new float[] {0.0f,  0.0f,  1.0f,  0.0f, 0.0f},
                                   new float[] {0.0f,  0.0f,  0.0f,  0.5f, 0.0f},//透明度:0.5
                                   new float[] {0.0f,  0.0f,  0.0f,  0.0f, 1.0f}
                                };

                                ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
                                imgAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
                                gWater.DrawImage(wrImage, new Rectangle(newImage.Width - wrImage.Width, newImage.Height - wrImage.Height, wrImage.Width, wrImage.Height), 0, 0, wrImage.Width, wrImage.Height, GraphicsUnit.Pixel, imgAttributes);
                                gWater.Dispose();
                            }
                            wrImage.Dispose();
                        }
                    }
                }

                //保存缩略图
                newImage.Save(savePath, System.Drawing.Imaging.ImageFormat.Jpeg);

                //释放资源
                newG.Dispose();
                newImage.Dispose();
                initImage.Dispose();
            }
        }


        public static Image ZoomAuto(Image image
            , System.Double targetWidth, System.Double targetHeight)
        {
            //创建目录


            //原始图片（获取原始图片创建对象，并使用流中嵌入的颜色管理信息）
            var initImage = image;

            //原图宽高均小于模版，不作处理，直接保存
            if (initImage.Width <= targetWidth && initImage.Height <= targetHeight)
            {

                return initImage;

            }
            else
            {
                //缩略图宽、高计算
                double newWidth = initImage.Width;
                double newHeight = initImage.Height;

                //宽大于高或宽等于高（横图或正方）
                if (initImage.Width > initImage.Height || initImage.Width == initImage.Height)
                {
                    //如果宽大于模版
                    if (initImage.Width > targetWidth)
                    {
                        //宽按模版，高按比例缩放
                        newWidth = targetWidth;
                        newHeight = initImage.Height * (targetWidth / initImage.Width);
                    }
                }
                //高大于宽（竖图）
                else
                {
                    //如果高大于模版
                    if (initImage.Height > targetHeight)
                    {
                        //高按模版，宽按比例缩放
                        newHeight = targetHeight;
                        newWidth = initImage.Width * (targetHeight / initImage.Height);
                    }
                }

                //生成新图
                //新建一个bmp图片
                System.Drawing.Image newImage = new System.Drawing.Bitmap((int)newWidth, (int)newHeight);
                //新建一个画板
                System.Drawing.Graphics newG = System.Drawing.Graphics.FromImage(newImage);

                //设置质量
                newG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                newG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

                //置背景色
                newG.Clear(Color.White);
                //画图
                newG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, newImage.Width, newImage.Height), new System.Drawing.Rectangle(0, 0, initImage.Width, initImage.Height), System.Drawing.GraphicsUnit.Pixel);


                //保存缩略图
                return newImage;

                ////释放资源
                //newG.Dispose();
                //newImage.Dispose();
                //initImage.Dispose();
            }
        }

        #endregion

        #region 其它

        /// <summary>
        /// 判断文件类型是否为WEB格式图片
        /// (注：JPG,GIF,BMP,PNG)
        /// </summary>
        /// <param name="contentType">HttpPostedFile.ContentType</param>
        /// <returns></returns>
        public static bool IsWebImage(string contentType)
        {
            if (contentType == "image/pjpeg" || contentType == "image/jpeg" || contentType == "image/gif" || contentType == "image/bmp" || contentType == "image/png")
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        #endregion


        /// <summary>
        /// 根据角度旋转图标
        /// </summary>
        /// <param name="img"></param>
        public static Image RotateImg(Image img, float angle)
        {
            //通过Png图片设置图片透明，修改旋转图片变黑问题。
            int width = img.Width;
            int height = img.Height;
            //角度
            Matrix mtrx = new Matrix();
            mtrx.RotateAt(angle, new PointF((width / 2), (height / 2)), MatrixOrder.Append);
            //得到旋转后的矩形
            GraphicsPath path = new GraphicsPath();
            path.AddRectangle(new RectangleF(0f, 0f, width, height));
            RectangleF rct = path.GetBounds(mtrx);
            //生成目标位图
            Bitmap devImage = new Bitmap((int)(rct.Width), (int)(rct.Height));
            Graphics g = Graphics.FromImage(devImage);
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //计算偏移量
            Point Offset = new Point((int)(rct.Width - width) / 2, (int)(rct.Height - height) / 2);
            //构造图像显示区域：让图像的中心与窗口的中心点一致
            Rectangle rect = new Rectangle(Offset.X, Offset.Y, (int)width, (int)height);
            Point center = new Point((int)(rect.X + rect.Width / 2), (int)(rect.Y + rect.Height / 2));
            g.TranslateTransform(center.X, center.Y);
            g.RotateTransform(angle);
            //恢复图像在水平和垂直方向的平移
            g.TranslateTransform(-center.X, -center.Y);
            g.DrawImage(img, rect);
            //重至绘图的所有变换
            g.ResetTransform();
            g.Save();
            g.Dispose();
            path.Dispose();
            return devImage;
        }


    }//end class

}
